Achlysictis Ameghino, 1891 † accepted as Thylacosmilus Riggs, 1933 † (original description)
Aconaemys Ameghino, 1891 (original description)
Adianthus Ameghino, 1891 † (original description)
Anthropops Ameghino, 1891 † (original description)
Catonyx Ameghino, 1891 † (original description)
Chalcinopelecus Holmberg, 1891 accepted as Pseudocorynopoma Perugia, 1891 (original description)
Dynamictis Ameghino, 1891 † accepted as Arctodictis Mercerat, 1891 † (original description)
Entocasmus Ameghino, 1891 † (original description)
Eucardiodon Ameghino, 1891 † accepted as Anchimys Ameghino, 1886 † (original description)
Eudiastatus Ameghino, 1891 † (original description)
Gephyranodus Ameghino, 1891 † (original description)
Gyriabrus Ameghino, 1891 † (original description)
Haplostropha Ameghino, 1891 † (original description)
Homocentrus Ameghino, 1891 † (original description)
Homunculus Ameghino, 1891, nom. nud. † accepted as Homunculus Ameghino, 1891 † (original description)
Hyperleptus Ameghino, 1891 † (original description)
Hypocoelus Ameghino, 1891 † accepted as Nothrotherium Lydekker in Nicholson & Lydekker, 1889 † (original description)
Ischyrorhynchus Ameghino, 1891 † (original description)
Lysiurus Ameghino, 1891 accepted as Cabassous McMurtrie in Cuvier, 1831 (original description)
Menilaus Ameghino, 1891 † (original description)
Nannodus Ameghino, 1891 † (original description)
Notiocetus Ameghino, 1891 † (original description)
Notohippus Ameghino, 1891 † (original description)
Opisthodactylus Ameghino, 1891 † (original description)
Ozotoceros Ameghino, 1891 (original description)
Palaeolithops Ameghino, 1891 † (original description)
Paraptenodytes Ameghino, 1891 † (original description)
Phororhacos Ameghino, 1891 † (original description)
Pontivaga Ameghino, 1891 † accepted as Pontistes Burmeister, 1885 † (original description)
Pontoplanodes Ameghino, 1891 † (original description)
Prepotherium Ameghino, 1891 † (original description)
Protibis Ameghino, 1891 † (original description)
Prozaedyus Ameghino, 1891 † (original description)
Pseudolarus Ameghino, 1891 † (original description)
Ranculcus Ameghino, 1891 † (original description)
Rhabdodon Ameghino, 1891 † (original description)
Sclerocalyptus Ameghino, 1891 † accepted as Hoplophorus Lund, 1838 † (original description)
Sphenotherus Ameghino, 1891 † (original description)
Stenotatus Ameghino, 1891 † (original description)
Strabosodon Ameghino, 1891 † (original description)
Strophostephanos Ameghino, 1891 † (original description)